Muffler



Jam 15, 1929.

A. C. ESTEP MUFFLER Filed Aug. '30, 1926 IINVENTOR Jazgaw 6: [572,0 9"

H k Mal/Wm 4 ATTORNEY Patented Jan. 15, 1929.

ADRIAN G, ESTEP, OF SEATTLE, WASHINGTON.

MUFFLER.

Application filed August 30, 1926. Serial No. 132,473.

My invention relates to improvements in exhaust mufflers for internal combustion en gines of the type disclosed in United States Letters Patent No. 1,144,702 issued October 20, 1914, and the object of my invention is to provide a simple andeffici'ent muffler that will smooth out the vibrations and eliminate the objectionable noise from the exhaust gas of an internal combustion engine. Another object is to provide a muffler that will eliminate the objectionable noise from the exhaust without increasing back pressure in the exhaust conduits of an engine to an undesirable extent.

A further object is to provide a muflier in which the discharging exhaust gases are thrown outwardly against the walls of a cylindrical drum thereby tending to cool and condense saidexhaust gases and in this way tending to reduce their volume.

Other objects are to provide an exhaust muffler of this nature that is rigid and substantial in construction, inexpensive to manufacture and easy to assemble.

Other and more specific objects will be apparent from the following description taken in connection with the accompanying drawings.

In the drawings Figure 1 is a longitudinal section substantially on broken line 11 of Fig. 2 of an exhaust muffier in accordance with my invention, parts being shown in elevation.

Figs. 2 and 3 are cross sectional views substantially on broken lines 22 and 33 respectively of Figs. 1; and

Fig. 4 is a detached sectional view of a detail of the invention.

Referring to the drawings, throughout which like reference numerals designate like parts, 6' is a cylindrical muffler drum that is secured by anchor bolts 7 to two disc like heads 8 and 10. The heads 8 and 10 are each provided on their inner surfaces with circular grooves 11 for the reception of the ends of the drum 6. The anchor bolts 7 may be riveted or otherwise rigidly secured to the inside of the drum 6 near the ends of the same.

A gas inlet pipe 12 is connected with the center of the head 8 at one end of the muffler and a short discharge nipple 13 is connected with the center of the head 10 at the opposite end.

The drum 6 is provided on one side with a hand hole 14 adapted to be closed by a plate or plates 15 secured in place by screws 16.

17 is a tubular muffler member open at one end and closed by a wall 18 at the opposite end and having external threads at its open end that are adapted to screw into an internally threaded centrally arranged boss 20 on the head 8, so that exhaust gases from an engine may have an unobstructed passageway from the pipe 12 into said muffler member 17 The muffler member 17 is provided, near its open end, with two oppositely positioned circumferential openings 21 each having an over hangingwing or deflector member 22 that extends outwardly from the tube 17 and is pref erably substantially tangential to said tube and that is adapted to impart a whirling motion to the gases that pass outwardly therethrough. Two other openings 23 having overhanging tangential wing 24 are provided near the closed end of the muffler tube 17. The openings 23 and wings 24 are preferably offset at substantially. ninety degrees relative to the openings 21 and wings 22. The wings 22 and 24 may be integral with the tube 17 and preferably have walls 25 at their edges connecting them with said tubes, which walls 25 prevent the gases from passing out at the sides of the wings and insure that said gases will be given a whirling motion and directed outwardly toward the peripheral walls of the drum 6.

An annular baflie plate 26 is secured to the tube 17 between the wings 22 and the wings 24 and terminates short of the walls of the drum 6 to leave a relatively large annular passageway through which gases discharging from the openings 21 may pass toward the discharge end of the muflier. A similar baffle plate 27 is provided on the closed end of the tube 17.

A centrally arranged tube 28 that is open at both ends and communicates with the dis charge nipple 18 extends from the discharge id 10 of the muffler inwardly and terminates near the closed end 18 of the tubular muffler member 17. The tube 28 leaves a surgmg chamber for the gases around said tube in the end of the mufiler adjacent the end plate 10.

In the operation of this exhaust muffler the exhaust gases from an internal combustion engine are discharged through the tube 12 into the tubular exhaust member 17 at high velocity and said gases in the form of puffs or waves strike the closed end 18 of the tube 17 and surge back and pass out through the openings 21 and 23 thereby imparting a whirling'motion thereto by the tangential wings 2:2 and 2st,, thence pass along the periphery of the drum 6 toward the discharge end 10 where their direction is again reversed and they are caused to pass forwardly and toward the center and out through the pipe 28 as is clearly shown by the arrows in Fig. 1. The whirl that is imparted to the gases by the tongues 22 and 2 itends to throw them outwardly against the walls of the drum 6 thus tending to cool and contract said The surging and reversal of the direction of movement or the gases in the tube 17 initially breaks up the vibrations or wave motions in said gases and said wave motion is further broken up by the whirling and the final sur W ing in the outlet end of the exhaust muitler until said gases are discharged into the atmosphere at a velocity and pressure that is nearly enough constant to render them free from objectionable noise.

Theforegoing description and accompany- 7 ing drawings clearly disclose a preferred embodiment of my inventien but it will be understood that this disclosure is merely illustrative and that such changes in'the device may be made as are within the scope and spirit of the following claims.

What I vclaim is :7

1. In an exhaust mutl'ler, a cylindrical drum having ends that are provided with axially arranged inlet and discharge openings, a discharge tube open at both ends that is connected with said discharge opening and extends lnto sald drum for a substantlal dictance and leaving a space between its walls and the cylindrical wall of said drum, a mutfler tube having an open and aelosed end disposed within said drum with its closed end extending in close proximity to said discln rge tube and its open end connected with said inlet opening, said muffler tube being provided with .two pair of circumferential openings, each pair comprising two oppositely positioned openings having tangential wings and one pair of which being oflset at substantially ninety degrees to the openings of the other pair. 7

In an exhaust muiiler, a cylindrical drum having ends that are provided with axially arranged inletand discharge openings, a discharge tube open'at both ends that is connected with said discharge opening and extending into said drum for a substantial distance and leaving: a space between its walls and the cylindrical wall of said drum, a mutll'er tube having an open and a closed end disposed within said drum with its closed end in close proximity to said discharge tube and its open end connected with said inlet opening, said muffler tube being provided with circumferential openings, a bathe plate disposed between said circumferential openings extending outwardly toward a wall of said drum, and another bafiie plate disposed at the closed end of said mufiier tube extending outwardly toward a wall or" said drum.

In witness whereof, I hereunto subscribe my name this 23rd day "of August, A. D. 1926.

ADRIAN o. ns'rnr. 

